Before the Lighthouse opened, they needed some lightbulbs to light up the Lighthouse Beacon. There was a scavenger hunt to find them. The free item was a Lighthouse Background.
The first lightbulb was between the Pet Shop and Pizza Parlor at the Plaza.
The second lightbulb was in the horse in the Lodge Attic.
The third lightbulb was by the speaker in the Dance Club.
The fourth lightbulb was by the cart in the Mine.
The fifth lightbulb was in the Boiler Room by clicking on the box.